Performance of different sources of organic manures in comparison with RDF and INM on nutrient uptake, nutrient balance and soil properties in rice-greengram cropping sequence

Abstract

during samba (August-December) season of 2012 and 2013 to study the effect of different sources of organic manures in comparison with INM and RDF on nutrient uptake and soil properties in rice (Oryza sativa L.). The experiment consisted of fourteen treatments which were laid out in Randomized Block Design, replicated thrice and SRI method of planting was adopted during both the years. Among fourteen treatments, four treatments with different organic manures at 100 per cent RDN on equi nutrient basis (farm yard manure, vermi-compost, poultry manure and (Dhaincha) green manure) another six treatments consisted of 50 per cent combination of each manure, one treatment with 1/4 th combination of all the manures and one absolute control (without organic or inorganic). These treatments were compared with the recommended dose of fertilizer (RDF) and integrated nutrient management practice (RDF + Dhaincha). Higher N, P and K uptake was observed with INM practice followed by RDF. Among the organic treatments, 100 per cent RDN through green manure resulted with higher nutrient uptake followed by 25 per cent RDN through each organic manures. Lower nutrient uptake was observed with absolute control where no fertilizers / manures received during both the years of study. The soil available N and P balance was positive with the INM treatment (85.0 and 5.10 kg ha-1) at the end of two year of cropping sequence. Among the organic treatments, 100 per cent RDN through green manure recorded the highest N balance (46.0 kg ha-1) followed by 25 per cent RDN through each organic manures (42.0 kg ha-1) at the end of the cropping system (2012-14). Similarly, the highest P balance was recorded with 25 per cent RDN through each organic manures (3.1 kg ha-1) and which was followed by 100 per cent RDN through green manure (3.0 kg ha-1) at end of the two years of cropping sequence. The least N and P balance was noticed with absolute control (-4.0 and-2.5 kg ha-1) at the end of cropping sequence. Invariably, all the treatments recorded net negative K balance in both the years of cropping sequence.

Improvement of Productivity, Agro-Meteorological Indices, Energetics and Nutrient Balance of Rice-Groundnut Cropping System

“…The negative K balance in the soil indicated that non-exchangeable form of K was released as a result of priming action of applied K. The net K loss was higher in DSR (-18.8 kg/ha), organic management in rice (-17.7 kg/ha) and 75% STBF in groundnut (-20.4 kg/ha) attributed to luxurious consumption of K by crops. Similar results with INM practice (RDF+green manuring) in rice-greengram cropping system was reported by Alagappan and Venkitaswamy (2016).…”

Effect of Organic Manures and Phosphorus on Soil Nutrient Status in Kharif Rice

“…This might be due to positive response of green manuring with inorganic fertilizers on soil N status and may be attributed to N mineralization from organic sources or by retaining N in labile microbial pool with the changing microbial flush. The most soil conditions might have helped the mineralization of soil N and greater multiplication of soil microbes, which could convert organically bound nitrogen into readily available form leading to building up of higher available N. The inclusion of green manure (Sesbania aculeate) in rice based cropping sequence reduced the loss of native nitrate N accumulated during aerobic cycle of the rice based cropping sequence and also conserved nitrate nitrogen, which would be lost upon flooding [4].…”

Effect of Integrated Nutrient Management Practices on Available Nutrient Status of Soil under Rice-Sorghum Cropping System in Clay Loamy Soils

“…This might be due to positive response of green manuring with inorganic fertilizers on soil N status and may be attributed to N mineralization from organic sources or by retaining N in labile microbial pool with the changing microbial flush. The moist soil conditions might have helped the mineralization of soil N and greater multiplication of soil microbes, which could convert organically bound nitrogen into readily available form leading to building up of higher available N. The inclusion of green leaf manure (Sesbania aculeata) in rice based cropping sequence reduced the loss of native nitrate N accumulated during aerobic cycle of the rice based cropping sequence and also conserved nitrate nitrogen, which would be lost upon flooding [6]. Increase in available P with FYM application and green manuring might be due to additional application of P and mobilization of P in the soil.…”